2011 AMC 10B Problems/Problem 5
Problem 5
In multiplying two positive integers and
, Ron reversed the digits of the two-digit number
. His erroneous product was
. What is the correct value of the product of
and
?
Solution
Since the was the erroneous product of two integers, one that had two digits, the two factors have to be
and
. Reverse the digits of the two-digit number so that
is
. Find the product of
and
.